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I have a 2018 IS 300 Fsport and having issues with my a/c. One side will work fine but the other will blow out warm air. The car is still fairly new could this be a recharging issue?
Turn off the dual zone so both temp settings read the same. If you still have an issue, then sounds like what ever is the issue, should be covered under warranty.
Had this happen to me when I first got my car and the passenger side would blow warm air regardless of temp or dual zone on or off. Dealer reset the system and it fixed it.